Treatment of Unresectable Colorectal Metastases by Radiofrequency Ablation Combined or Not With Resection, With or Without Neoadjuvant Chemotherapy.

The hypothesis is that radiofrequency ablation combined or not with resection may allow a local control (the liver) in patients suffering from unresectable colorectal liver metastases. Patients may have benefit or not from a preoperative (neoadjuvant) chemotherapy.